Research Of Collapsing Process Of Directional Blasting Demolition Of Towering Building And Tall Building

Both the height and the difficulty of chimney blasting demolition are increasing gradually. This paper establishes stress models of the supported segment of the remaining based on dynamic principle, and analyzes the regulation and the determining factor of the variation of cut neutral axis. The punching factor is used to consider with influence of sudden load. We adopt the node-split reinforced concrete model, and make the numerical simulation study of the reinforced concrete chimney collapse process by means of ANSYS/LS-DYNA. Through the analysis of the stress-time curve of reinforced concrete element, it is indicated that a node split model can reflect the difference of the mechanical properties between materials of steel and concrete.Blasting demolition has been developing rapidly for it's economic, practical and safe. This article analyzes collapse mechanism of reinforced concrete frame-shear wall structured blasting demolition with the use of mechanical principles. In addition, using the finite element software ANSYS/LS-DYNA, this essay will study the numerical simulation of the process of building's collapse with the separate models. By numerical simulation, it will also contrast the characteristics of collapse before and after pre-weakening. and indicate that pre-weakening is an important technical measure to ensure the the whole structure's smooth instability collapse and disintegration. Finally, by analyzing the element stress-time curve of concrete and steel, this essay will examine that the common node separate model can better reflect the different mechanical properties of reinforcement and concrete. The results of this research can provide useful reference for future modeling and analysis of similar structures.